page_title: Japanese railway signals
section_title: High-speed signal
hierarchical_section_title: Japanese railway signals / Fixed signals / Main signals / High-speed signal
caption_attribution_description: 日本語: 北越急行ほくほく線、虫川大杉駅の出発信号機のGG信号（ホームから撮影）
context_page_description: Japanese railway signals, according to the ministerial decree defining technical standards of railways, are defined as indicating operational conditions for railway staff driving trains.
  Japanese signalling was initially based on British railway signalling, and Japanese railway signalling continues to be based on the UK route signalling system. However, as signalling has advanced to meet the requirements of the system, the Japanese signalling system is a mixture of route signalling and American speed signalling.
context_section_description: There are six- and five-light high-speed signals (高速信号機,, kōsoku shingōki) with two green lights. In a six-light signal, the additional green light is located above the yellow light; in a five-light signal, the additional green light replaces the top yellow light (eliminating the speed-restriction signal). Two green lights indicate high-speed (no speed limit), and one green light (proceed signal) indicates a 130 kilometres per hour (81 mph) speed limit. 
  The high-speed signal was introduced on the Hokuetsu Express Hokuhoku Line in 1997, where Hakutaka limited express services ran until 2015 at a top speed of 160 kilometres per hour (99 mph). In 2010, high-speed signals were introduced for 160 km/h Skyliner services on the Keisei Narita Airport Line.
caption: High-speed signal (five-light type)
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